Abstract

In this Letter, an electro-optic dual-comb spectrometer with a central tunable range of 7.77–8.22 µm is demonstrated to perform transient absorption spectroscopy of the simplest Criegee intermediate (${{\rm{CH}}_2}{\rm{OO}}$), a short-lived species involved in many key atmospheric reactions, and its self-reaction product via comb-mode-resolved spectral sampling at microsecond temporal resolution. By combining with a Herriott-type flash photolysis cell, ${{\rm{CH}}_2}{\rm{OO}}$ can be probed with a detection limit down to ${\sim}{{1}} \times {{10}^{11}}\; {\rm molecules }\,{{\rm{cm}}^{- 3}}$. Moreover, pressure broadening of ${{\rm{CH}}_2}{\rm{OO}}$ absorption lines can be studied with spectrally interleaved dual-comb spectroscopy. This Letter holds promise for high-resolution precision measurements of transient molecules, especially for the study of large molecules in complex systems.

© 2020 Optical Society of America

Mid-infrared electro-optic dual-comb spectroscopy with feedforward frequency stepping

Xinyi Ren, Hu Dai, Detian Li, Kun Huang, Mengyun Hu, Tianjian Lv, Ming Yan, and Heping Zeng
Opt. Lett. 45(3) 776-779 (2020)

Direct hyperspectral dual-comb gas imaging in the mid-infrared

Farid Ullah Khan, Guillermo Guarnizo, and Pedro Martín-Mateos
Opt. Lett. 45(19) 5335-5338 (2020)

Time-resolved dual-comb spectroscopy with a single electro-optic modulator

Jeong Hyun Huh, Zaijun Chen, Edoardo Vicentini, Theodor W. Hänsch, and Nathalie Picqué
Opt. Lett. 46(16) 3957-3960 (2021)

Ultrafast laser-absorption spectroscopy for single-shot, mid-infrared measurements of temperature, CO, and CH₄ in flames

Ryan J. Tancin, Ziqiao Chang, Mingming Gu, Vishnu Radhakrishna, Robert P. Lucht, and Christopher S. Goldenstein
Opt. Lett. 45(2) 583-586 (2020)

VECSEL-based virtually imaged phased array spectrometer for rapid gas phase detection in the mid-infrared

Robert Rockmore, Ricky Gibson, Jerome V. Moloney, and R. Jason Jones
Opt. Lett. 45(20) 5796-5799 (2020)